Somta Long Series Drill - HSS-E Parabolic Flute - 5.3mm

Somta Long Series Drill — HSS-E Parabolic Flute — 5.3mm is engineered for serious deep-hole work where standard drills falter. This long-reach twist drill pairs a precise 5.3mm diameter with a robust HSS-E (cobalt-enhanced high-speed steel) body, delivering dependable performance in demanding metalworking tasks.

What makes this drill stand out is its parabolic flute geometry. The parabolic design optimizes chip evacuation and reduces cutting forces, so you get smoother starts, less clogging, and cleaner holes even as you drill deeper. The result is extended tool life and more consistent hole quality across the full depth of the workpiece.

Key benefits

• Long length for deep through-holes: reach thick materials and through assemblies without repositioning or switching tools.
• HSS-E construction: excellent heat resistance and durability for metalworking in steels, stainless steels, cast iron, and other tough alloys.
• Parabolic flute design: rapid chip clearance, reduced thrust, and cooler operation to protect both drill and workpiece.
• Sharp, precise edges: clean, accurate hole starts with minimal burrs and consistent diameter along the depth.
• Friction and heat control: flute geometry minimizes heat buildup, helping maintain tolerance and extending usable life.

Ideal use cases

Perfect for fabrication shops, automotive repair and assembly, and general metalworking where deep, straight holes are required in thick plates or components. Use in steel, stainless steel, aluminum alloys, and cast iron where reliability and hole quality matter more than speed.

Practical tips for best results

• Start with a centered pilot spot or center punch to ensure precise entry and reduce walk.
• Use a slow to moderate spindle speed with a steady, even feed to maximize edge life and hole quality.
• Employ peck drilling to clear chips and prevent chip packing in deep holes; lift frequently to flush debris.
• Apply appropriate coolant or cutting fluid to manage heat, especially on stainless and hard alloys.
• Secure the workpiece firmly and maintain a true, perpendicular approach to avoid deflection and tapering of the hole.

Whether you’re finishing a production run or tackling a precision deep-hole task, the Somta Long Series Drill in 5.3mm delivers dependable accuracy, efficient chip management, and enduring performance in challenging metals. It’s the go-to choice when depth, consistency, and tool life matter as much as the hole itself.